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libnvdimm, pfn: fix nvdimm_namespace_add_poison() vs section alignment
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When section alignment padding is in effect we need to shift / truncate
the range that is queried for poison by the 'start_pad' or 'end_trunc'
reservations.

It's easiest if we just pass in an adjusted resource range rather than
deriving it from the passed in namespace.  With the resource range
resolution pushed out to the caller we can also push the
namespace-to-region lookup to the caller and drop the implicit pmem-type
assumption about the passed in namespace object.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@djbw
djbw committed Apr 8, 2016
1 parent e567056 commit a390180
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Showing 3 changed files with 51 additions and 30 deletions.
41 changes: 20 additions & 21 deletions drivers/nvdimm/core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -417,8 +417,8 @@ static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len)
set_badblock(bb, start_sector, num_sectors);
}

static void namespace_add_poison(struct list_head *poison_list,
struct badblocks *bb, struct resource *res)
static void badblocks_populate(struct list_head *poison_list,
struct badblocks *bb, const struct resource *res)
{
struct nd_poison *pl;

Expand Down Expand Up @@ -460,36 +460,35 @@ static void namespace_add_poison(struct list_head *poison_list,
}

/**
* nvdimm_namespace_add_poison() - Convert a list of poison ranges to badblocks
* @ndns: the namespace containing poison ranges
* @bb: badblocks instance to populate
* @offset: offset at the start of the namespace before 'sector 0'
* nvdimm_badblocks_populate() - Convert a list of poison ranges to badblocks
* @region: parent region of the range to interrogate
* @bb: badblocks instance to populate
* @res: resource range to consider
*
* The poison list generated during NFIT initialization may contain multiple,
* possibly overlapping ranges in the SPA (System Physical Address) space.
* Compare each of these ranges to the namespace currently being initialized,
* and add badblocks to the gendisk for all matching sub-ranges
* The poison list generated during bus initialization may contain
* multiple, possibly overlapping physical address ranges. Compare each
* of these ranges to the resource range currently being initialized,
* and add badblocks entries for all matching sub-ranges
*/
void nvdimm_namespace_add_poison(struct nd_namespace_common *ndns,
struct badblocks *bb, resource_size_t offset)
void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct badblocks *bb, const struct resource *res)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
struct nvdimm_bus *nvdimm_bus;
struct list_head *poison_list;
struct resource res = {
.start = nsio->res.start + offset,
.end = nsio->res.end,
};

nvdimm_bus = to_nvdimm_bus(nd_region->dev.parent);
if (!is_nd_pmem(&nd_region->dev)) {
dev_WARN_ONCE(&nd_region->dev, 1,
"%s only valid for pmem regions\n", __func__);
return;
}
nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
poison_list = &nvdimm_bus->poison_list;

nvdimm_bus_lock(&nvdimm_bus->dev);
namespace_add_poison(poison_list, bb, &res);
badblocks_populate(poison_list, bb, res);
nvdimm_bus_unlock(&nvdimm_bus->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_namespace_add_poison);
EXPORT_SYMBOL_GPL(nvdimm_badblocks_populate);

static int add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
{
Expand Down
4 changes: 2 additions & 2 deletions drivers/nvdimm/nd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -266,8 +266,8 @@ int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
char *name);
void nvdimm_namespace_add_poison(struct nd_namespace_common *ndns,
struct badblocks *bb, resource_size_t offset);
void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct badblocks *bb, const struct resource *res);
int nd_blk_region_init(struct nd_region *nd_region);
void __nd_iostat_start(struct bio *bio, unsigned long *start);
static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
Expand Down
36 changes: 29 additions & 7 deletions drivers/nvdimm/pmem.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -244,7 +244,9 @@ static void pmem_detach_disk(struct pmem_device *pmem)
static int pmem_attach_disk(struct device *dev,
struct nd_namespace_common *ndns, struct pmem_device *pmem)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
int nid = dev_to_node(dev);
struct resource bb_res;
struct gendisk *disk;

blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
Expand All @@ -271,8 +273,17 @@ static int pmem_attach_disk(struct device *dev,
devm_exit_badblocks(dev, &pmem->bb);
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset);

bb_res.start = nsio->res.start + pmem->data_offset;
bb_res.end = nsio->res.end;
if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

bb_res.start += __le32_to_cpu(pfn_sb->start_pad);
bb_res.end -= __le32_to_cpu(pfn_sb->end_trunc);
}
nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb,
&bb_res);
disk->bb = &pmem->bb;
add_disk(disk);
revalidate_disk(disk);
Expand Down Expand Up @@ -553,7 +564,7 @@ static int nd_pmem_probe(struct device *dev)
ndns->rw_bytes = pmem_rw_bytes;
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
nvdimm_badblocks_populate(nd_region, &pmem->bb, &nsio->res);

if (is_nd_btt(dev)) {
/* btt allocates its own request_queue */
Expand Down Expand Up @@ -595,14 +606,25 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
{
struct pmem_device *pmem = dev_get_drvdata(dev);
struct nd_namespace_common *ndns = pmem->ndns;
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct resource res = {
.start = nsio->res.start + pmem->data_offset,
.end = nsio->res.end,
};

if (event != NVDIMM_REVALIDATE_POISON)
return;

if (is_nd_btt(dev))
nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
else
nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset);
if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

res.start += __le32_to_cpu(pfn_sb->start_pad);
res.end -= __le32_to_cpu(pfn_sb->end_trunc);
}

nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
}

MODULE_ALIAS("pmem");
Expand Down

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